ICT Single-Candle Order Block (SCOB): Rules and Test Design

Framework note: ICT terms are interpretations of price action, not proof of institutional motives or a market algorithm’s intent. No setup is guaranteed. Test clearly defined rules, account for costs and slippage, and use risk limits before risking capital. Read our editorial policy.

A Single Candle Order Block (SCOB) is a label some ICT traders apply when they use one candle as the reference zone for an order-block setup. The candle can make the rule easier to specify, but it does not prove a single institutional zone or guarantee a more consistent entry.

What Makes an OB a Single Candle OB?

A standard Order Block may consist of the last one, two, or three opposing candles before a displacement. When the OB formation is reduced to a single candle — where that one candle clearly and completely identifies the institutional zone — it becomes an SCOB. The SCOB is characterized by a single candle with a clear body (open to close) that represents the full price range of the institutional order placement, followed immediately by a displacement move.

The commonly discussed SCOBs are formed by candles with relatively small wicks compared to the body — meaning the majority of the candle's range was the body (the actual trading range), not the wick (the rejection). A candle with 80%+ of its range as body and minimal wick is a premium SCOB because the entire body represents active institutional order placement at that price range.

SCOB vs Standard OB — The Precision Advantage

In a standard 3-candle OB sequence, you must decide which of the three candles is the OB itself, and which specific level within that candle is the entry. This introduces subjectivity. In an SCOB, there is no ambiguity: the single candle is the OB. The CE of the single candle body is the entry. The high of the body is the upper boundary; the low of the body is the lower boundary.

This precision allows for tighter stops. Because the entire OB zone is one candle body, the stop placement (just beyond the body) is typically tighter than a multi-candle OB stop, which must cover the full range of the multi-candle formation. Tighter stops + same targets = better risk-to-reward ratios from SCOB entries versus standard OB entries.

Trading the SCOB

• •Identify the single candle that acted as the last opposing candle before the nearest displacement move.
• •Confirm it is an SCOB: the OB zone is entirely contained within one candle, with a clear body and minimal conflicting structure.
• •Mark the body high, body low, and body CE (midpoint between open and close).
• •Set a limit order at the CE. Stop: beyond the body extreme (below body low for bullish SCOB, above body high for bearish SCOB).
• •Target: the next liquidity pool in the direction of the post-SCOB displacement.
• •Confirmation: after price enters the SCOB zone, watch the 1-minute or 5-minute for a reaction FVG within the SCOB body — enter at its CE for maximum precision.

Worked hypothetical example

Suppose a trader's written SCOB rule requires a single candle whose body is at least 70% of its total range and whose close is followed by a predefined structure break. A candle that looks strong but fails the size or follow-through condition is excluded. The 70% threshold is an example for this hypothetical rule, not an official universal standard.

Failure case and what to test

Changing the body threshold or redefining the reference candle after observing later price will inflate apparent success. A large candle can occur during a news spike and still fail to create a useful entry.

Test checklist

• •Choose the body-to-range threshold before backtesting.
• •Separate the candle pattern from required confirmation and entry.
• •Include failures, costs and no-retest examples in the sample.

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